/*
 * Copyright 2009 Tran Nhut Trung.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and 
 * limitations under the License.
 */
package org.eclipse.core.databinding.observable.gwt.internal;

import com.google.gwt.user.client.ui.HasWordWrap;
import com.google.gwt.user.client.ui.Widget;

import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.databinding.observable.gwt.IWidgetObservable;


public class HasWordWrapObservableValue extends WidgetPropertyObservableValue implements IWidgetObservable {
  private HasWordWrap wordWrapWidget;
  private boolean updating = false;
  private Boolean oldValue;

  public HasWordWrapObservableValue(HasWordWrap wordWrapWidget) {
    this(Realm.getDefault(), wordWrapWidget);
  }
  public HasWordWrapObservableValue(Realm realm, HasWordWrap wordWrapWidget) {
    super(realm, (Widget)wordWrapWidget, "wordWrap");
    this.wordWrapWidget = wordWrapWidget;
    
    this.oldValue = (Boolean)doGetValue();
  }

  protected void doSetApprovedValue(Object value) {
    if (wordWrapWidget == null){
      return;
    }
    
    try {
      updating = true;
      wordWrapWidget.setWordWrap(value==null ? false : (Boolean)value);
      oldValue = (Boolean)doGetValue();
    } finally {
      updating = false;
    }
  }

  public Object doGetValue() {
    if (wordWrapWidget == null){
      return null;
    }

    return wordWrapWidget.getWordWrap();
  }

  public Object getValueType() {
    return String.class;
  }
}
